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X(3), X(54), X(96), X(1147)

vertices of the circumnormal triangle, points on the McCay cubic.

isogonal conjugates of the Ix-anticevian points. See Table 23.

imaginary foci of the Brocard ellipse i.e. common points of the Brocard axis and the Kiepert hyperbola

K373 is an example of circumnormal pK. See also K361 and Table 25.

Its pole is X(14533), the isogonal conjugate of X(324).

It is the isogonal transform of K049, the McCay orthic cubic.

It has the same asymptotic directions as pK(X6, X52).

The tangents at A, B, C, X(54) concur at O, the isopivot of the pK.

The tangential of O is X(1147), the X(54)-Ceva conjugate of O.

K373 is a member of the pencil of cubics generated by K005 and K073.

K373 is the Laplacian of the quintic Q084 i.e. the locus of points whose polar conic in the quintic is a rectangular hyperbola.